EN 1759-1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach Class bezeichnet - Teil 1: Stahlflansche, NPS 1/2 bis 24Brides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie, raccords et accessoires, désignées Class - Partie 1 : Brides en acier NPS 1/2 a 24Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class designated - Part 1: Steel flanges, NPS 1/2 to 2423.040.60Prirobnice, oglavki in spojni elementiFlanges, couplings and jointsICS:Ta slovenski standard je istoveten z:EN 1759-1:2004SIST EN 1759-1:2005en01-marec-2005SIST EN 1759-1:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1759-1November 2004ICS 23.040.60English versionFlanges and their joint - Circular flanges for pipes, valves,fittings and accessories, Class designated - Part 1: Steelflanges, NPS 1/2 to 24Brides et leurs assemblages - Brides circulaires pour tubes,appareils de robinetterie, raccords et accessoires,désignées Class - Partie 1 : Brides en acier NPS 1/2 à 24Flansche und ihre Verbindungen - Runde Flansche fürRohre, Armaturen, Formstücke und Zubehörteile, nachClass bezeichnet - Teil 1: Stahlflansche, NPS 1/2 bis 24This European Standard was approved by CEN on 30 September 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1759-1:2004: ESIST EN 1759-1:2005

Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Designation.7 5 General requirements.8 Annex A (informative)
Recommendations for weld ends of weld-neck flanges.65 Annex B (informative)
Classification of bolting materials.66 Annex C (informative)
Use of metric bolting in lieu of imperial bolting.67 Annex D (informative)
Determination of p/T ratings for flanges using EN materials.69 Annex E (normative)
Approximate masses of flanges and collars.70 Bibliography.74
3 Foreword This document (EN 1759-1:2004) has been prepared by Technical Committee CEN/TC 74 "Flanges and their joints" the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. EN 1759 consists of the following parts:  Part 1: Steel flanges;  Part 3: Copper alloy flanges1;  Part 4: Aluminium alloy flanges1. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
1 To be published SIST EN 1759-1:2005

Introduction When Technical Committee, CEN/TC 74, commenced its work of producing this European standard it took as its basis, the International Standard, ISO 7005-1, Steel flanges. In taking this decision, CEN/TC 74, agreed that this standard would differ significantly from the ISO standard in respect of the following: a) Whereas ISO 7005-1 included in its scope both the original DIN based flanges and also the original ANSI/ASME based flanges, EN 1759-1 contains only the flanges with ANSI/ASME origin (ASME B16.5). CEN/TC 74 has produced a separate series of standards, EN 1092 Parts 1, 2, 3 and 4, dealing with the DIN based flanges in PN designations; b) In this standard, the flanges are Class designated (not PN designated as in the ISO standard) and those dimensions taken from ASME B16.5 are hard metricated. Consequently, whilst the mating dimensions, the flange and facing types and designations are compatible with those given in ISO 7005-1, it is important to take account of the following differences which exist in EN 1759-1: 1) The use of inch bolting requires the use of suitable gaskets, not necessarily compatible with the gaskets used with ISO 7005-1 flanges (for metric bolts). 2) This standard specifies grades of ASTM steels similar to those specified in ISO 7005-1, but in addition permits the use of grades of European steels according to EN 1092-1;
5 1 Scope This European Standard for a single system of flanges specifies requirements for circular steel flanges in Class designations Class 150 to Class 2 500 and nominal sizes from NPS ½ to NPS 24. NOTE The relationship between nominal size (DN) and nominal size (NPS) is given for reference purposes in Tables 9
to 14. This standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials and pressure/temperature ratings. This standard does not apply to flanges made from bar stock by turning, or to flanges of types 11, 12, 13, 14 and 15 made from plate material. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1515-1, Flanges and their joints — Bolting — Part 1: Selection of bolting prEN 1515-3, Flanges and their joints — Bolting — Part 3: Classification of bolt materials for steel flanges, class designated EN 10025, Hot rolled products of non-alloy structural steels — Technical delivery conditions EN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non alloy and alloy steels with specified elevated temperature properties EN 10028-3, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels, normalized EN 10028-4, Flat products made of steels for pressure purposes — Part 4: Nickel alloy steels with specified low temperature properties EN 10028-7, Flat products made of steels for pressure purposes — Part 7: Stainless steels EN 10213-2, Technical delivery conditions for steel castings for pressure purposes — Part 2: Steel grades for use at room temperature and elevated temperatures EN 10213-3, Technical delivery conditions for steel castings for pressure purposes — Part 3: Steel grades for use at low temperatures EN 10213-4, Technical delivery conditions for steel castings for pressure purposes — Part 4: Austenitic and austenitic-ferritic steel grades EN 10222-2, Steel forgings for pressure purposes — Part 2: Ferritic and martensitic steels with specified elevated temperature properties EN 10222-3, Steel forgings for pressure purposes — Part 3: Nickel steels with specified low temperature properties EN 10222-4, Steel forgings for pressure purposes — Part 4: Weldable fine grain steels with high proof strength EN 10222-5, Steel forgings for pressure purposes - Part 5: Martensitic, austenitic and austenitic-ferritic stainless steels EN ISO 887, Plain washers for metric bolts, screws and nuts for general purposes - General plan (ISO 887:2000) EN ISO 6708, Pipe components — Definition and selection of DN (nominal size) (ISO 6708:1995) ISO 4955, Heat-resisting steels and alloys SIST EN 1759-1:2005

ISO 4991, Steel castings for pressure purposes ISO 9327-1, Steel forgings and rolled or forged bars for pressure purposes — Technical delivery conditions —Part 1: General requirements
ISO 9327-2, Steel forgings and rolled or forged bars for pressure purposes —Technical delivery conditions — Part 2: Non-alloy and alloy (Mo, Cr and CrMo) steels with specified elevated temperature properties ISO 9328-2, Steel flat products for pressure purposes — Technical delivery conditions —Part 2: Non-alloy and alloy steels with specified elevated temperature properties ISO 9328-3, Steel flat products for pressure purposes — Technical delivery conditions — Part 3: Weldable fine grain steels, normalized ISO 9328-5, Steel flat products for pressure purposes —
Technical delivery conditions — Part 5: Weldable fine grain steels, thermomechanically rolled ASME B16.5: 1996 Pipe flanges and flanged fittings — NPS ½ through NPS 24 ASME/ANSI B1.20.1, Pipe threads, general purpose (inch) ASTM A105/A105M, Forgings, Carbon Steel, for Piping Component ASTM A182/A182M, Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service ASTM A203/A203M, Pressure Vessel Plates, Alloy Steel, Nickel ASTM A204/A204M, Specification for pressure vessel plates, alloy steel, molybdenum ASTM A216/A216M, Steel Castings, Carbon Suitable for Fusion Welding for High-Temperature Service ASTM A217/A217M, Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts Suitable for High-Temperature Service ASTM A240/A240M, Heat-Resisting Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels ASTM A325, High-Strength Bolts for Structural Steel Joints ASTM A350/A350M, Forgings, Carbon and Low-Alloy Steel, Requiring Notch Toughness Testing for Piping Components ASTM A351/A351M, Castings, Austenitic, Austenitic-Ferritic (Duplex) for Pressure-Containing Parts ASTM A352/A352M, Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts Suitable for Low-Temperature Service ASTM A387/A387M, Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum ASTM A515/A515M, Pressure Vessel Plates, Carbon Steel, for Intermediate and Higher-Temperature Service ASTM A516/A516M, Pressure Vessel Plates, Carbon Steel, for Moderate and Lower-Temperature Service ASTM A537/A537M, Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 Class alphanumeric designation used for reference purposes related to a combination of mechanical and dimensional characteristics of a component of a pipework system.
It comprises the word Class followed by a dimensionless whole number NOTE 1 The number following the word Class does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard. SIST EN 1759-1:2005

7 NOTE 2 The designation Class is not meaningful unless it is related to the relevant component standard number. NOTE 3 It is intended that all components with the same Class and NPS (see below) designations should have the same mating dimensions for compatible flange types. 3.2 DN see EN ISO 6708 3.3 NPS alphanumeric designation of size for components of a pipework system, which is used for reference purposes. It comprises, for the purpose of Class designated flanges according to this standard, the letters NPS followed by a dimensionless number which is indirectly related to the physical size of the bore or outside diameter of the end connections NOTE The number following the letters NPS does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard. 3.4 maximum allowable pressure, PS means the maximum pressure for which the equipment is designed, as specified by the equipment manufacturer 3.5 maximum allowable temperature, TS means the maximum temperature for which the equipment is designed, as specified by the equipment manufacturer 4 Designation 4.1 General Table 1 and Figure 1 show the flange types and their relevant type numbers. Flanges shall be denoted with "flange type" and "flange number". Figure 2 shows flange facing types, which may be used with the flanges shown in Figure 1. Flange facings shall be denoted with "type" and the relevant symbol. The range of NPS, applicable to each flange type and each Class designation shall be as given in Table 2. 4.2 Information to be supplied by the equipment manufacturer
The following information should be supplied by the equipment manufacturer in the enquiry and/or order. Flanges and ancillary components in accordance with this standard shall be designated with the following: a) Designation, e.g. flange, lapped or collar; b) Number of this standard, EN 1759-1; c) Flange type number (see Table 1); d) Facing type number (see Figure 2); e) Nominal size (NPS or DN); f) Class designation followed by the appropriate number; g) The bore for weld-neck (type 11) and hubbed slip-on (type 12) flanges, if different from those specified in this standard (see notes to Tables of flange dimensions). h) Weld end preparation required (see Annex A); SIST EN 1759-1:2005

i) Either the symbol or the number or the grade of the material (see 5.1 and Tables 3a and 3b); j) Any heat treatment required k) Material certificate, if required (see 5.1.1); EXAMPLE 1 Designation of a flange type 01 with facing type A of nominal size DN 400 and Class number 150, made of material of group 1.1 Flange EN 1759-1 / 01 / A/DN 400 / Class 150 / material group 1.1 EXAMPLE 2 Designation of a flange type 05 with facing type C of nominal size NPS 6 and Class number 600, made of material ASTM A105 with certificate 3.1B Flange EN 1759-1 / 05 / C / NPS 6 / Class 600 / A105 / 3.1B EXAMPLE 3 Designation of a flange type 11 with facing type B of nominal size DN 300 and Class number 900, bore B3 = 298 mm, made of material of group 6E0 Flange EN 1759-1 / 11 / B / DN 300 / Class 900 / 298 / material group 6E0 5 General requirements 5.1 Flange materials 5.1.1 General Flanges shall be manufactured from materials given in Tables 3a and 3b. Flanges type 11, 12, 13, 14, 15 and 21 shall be made from forgings. Flanges type 21 shall be made from forgings or steel castings. NOTE The materials given in Tables 3a and 3b are tabulated in groups having common pressure/temperature ratings as given in Tables 16 to22. The flange manufacturer shall provide documentation to ensure traceability of material. An equipment manufacturer may require a material certificate in accordance with EN 10204, which is suitable for the category of equipment to which the flange is fitted. 5.1.2 Non alloy steels The carbon content by ladle analysis of the materials specified in Tables 3a and 3b shall not exceed 0,23 % for plate and for forgings and 0,25 % for castings. The steel manufacturer shall ensure on a basis of regular production checks that the carbon equivalent (CEV) by cast analysis does not exceed 0,45 % where: 15CuNi5VMoCr6MnCEV++++++=C NOTE The above carbon equivalents do not apply to flange types 01, 05 and 21 manufactured from plate material. 5.2 Repairs No repair welding shall be permitted without prior approval of the equipment manufacturer and when prohibited by the applicable material standard. SIST EN 1759-1:2005

9 Where permitted, repair welding shall be carried out by a proven method and shall be in accordance with a written procedure. Material repaired by welding shall be marked with the letter W following the specification number. NOTE For approval of welding procedures, see EN ISO 15607. For approval of welders, see EN 287-1. 5.3 Bolting 5.3.1 General Flanges shall be suitable for use with the nominal size and number of bolts specified in Tables 9 to 14 as appropriate. The bolting shall be chosen according to the pressure, temperature, flange material and gasket so that the flanged joint remains tight under the expected operating conditions. 5.3.2 Selection of bolting For selection of bolting, see EN 1515-1, for classification of bolting materials see prEN 1515-3 and Annex B. Bolting of other materials should be chosen according the parameters above. NOTE For use of metric bolting see Annex C. 5.4 Gaskets The various gasket types, dimensions, design characteristics and materials used are not within the scope of this standard. Dimensions of gaskets are given in EN 12560 Parts 1 to 7. 5.5 Pressure/temperature (p/T) ratings The pressure/temperature ratings of the flanges manufactured from the materials specified in Tables 3a and 3b shall be as given in Tables 16, 17, 18, 19, 20, 21 and 22 for the applicable materials, and shall not exceed the value of the Class shown. NOTE 1 Linear interpolation is permitted for intermediate temperatures. NOTE 2 The pressure/temperature ratings of flanges depend upon the properties of the materials specified in Tables 3a and 3b. For determination of p/T ratings for EN materials see Annex D. 5.6 Dimensions 5.6.1 Flanges The dimensions of flanges shall be as given in Tables 9 to 14, and as qualified by 5.8 and the notes to Tables 9 to 14, if appropriate. The diameter of shoulder, dimension G, may be varied from the given value (see note 2), which is a maximum limit. NOTE 1 The equipment manufacturer should specify in the enquiry and/or order if dimensions of flanges are to be affected by 5.8 and/or the notes to Tables 9 to 14. NOTE 2 The centre portion of the face of a blank flange (type 05) need not be machined provided that the diameter of the unmachined portion does not exceed the recommended shoulder diameter, G, given in Tables 9 to 14. NOTE 3 A summary of the various types of flanges specified showing the nominal sizes applicable to each type and to each class is given in Table 2. SIST EN 1759-1:2005

5.6.2 Hubs The hubs of slip-on for welding (type 12) and threaded (type 13) flanges shall be either: a) parallel; or b) have a draft angle of not exceeding 7° on the outside surface for forging or casting purposes.
For details of the weld preparation for weld-neck flanges (type 11) see Annex A. 5.6.3 Threaded flanges 5.6.3.1 The threads of hubbed threaded flanges (type 13) shall be taper according to ASME/ANSI B1.20.1. 5.6.3.2 The thread shall be concentric with the axis of the flange and misalignments shall not exceed 5 mm per metre. Class 150 flanges shall be manufactured without a counterbore, but to protect the thread they shall be chamfered to the major diameter of the thread at the hubbed side of the flange, at an angle between 30° and 50° with the axis of the thread. The chamfer shall be concentric with the thread and shall be included in the measurement of the thread length provided that the chamfer does not exceed one pitch in length. Class 300, 600, 900, 1 500 and 2 500 flanges shall be provided with a counterbore as indicated in Tables 10 to 14 and the thread shall be chamfered to an angle between 30° and 50° at the bottom of the counterbore. The chamfer shall be concentric with the thread and shall have a major diameter equal to that of the counterbore. 5.6.4 Bolt holes Bolt holes shall be equally spaced on the pitch circle diameter. In the case of type 21 flanges they shall be positioned such that they are symmetrical to the principal axes and such that no holes fall on these axes i.e. positioned
“off-centre”, see Figures 5 to 12. 5.7 Flange facings 5.7.1 Types of facings The types of flange facings and flange face designations shall be as given in Figure 2. Dimensions of facings shall be as given in Figures 4, 5, 6, and 7 and Tables 5 and 6. For facings types B, D and F the transition from the edge of the raised face to the flange face shall be by: a) radius; or b) chamfer. 5.7.2 Lapped type joints Facings for lapped type joints (Figure 6) shall be one of the following types: B, C, D, E, F and J. The facings shall be in accordance with 5.7.1. The dimension t, indicated in Figure 6 shall be not less than the minimum thickness of the barrel of the stub-end, except that in the case of a spigot or tongue facing, the dimension t shall be not less than 6,4 mm. 5.7.3 Jointing face finish 5.7.3.1 All flange jointing faces shall be machine finished and shall have a surface finish in accordance with the values given in Tables 7 and 8 when compared with reference specimens by visual or tactile means. SIST EN 1759-1:2005

11 NOTE It is not intended that instrument measurements be taken on the faces themselves: the Ra and Rz values as defined in EN ISO 4287 relate to the reference specimens. 5.7.3.2 For flanges with facing types A, B, E and F turning shall be carried out with a round-nosed tool in accordance with Table 7. 5.7.3.3 For tongue and groove and ring-joint facing types C, D and J the gasket contact surfaces shall be machined to produce a surface finish in accordance with Table 8. 5.8 Spot facing or back facing of flanges Any spot facing or back facing shall not reduce the flange thickness to less than the thickness specified.
When spot facing is used, the diameter shall be large enough to accommodate the outside diameter of the equivalent normal series of washers in accordance with EN ISO 887 for the bolt size being fitted. The bearing surfaces for the bolting shall be parallel to the flange face within the limits given in Table 15. When a flange is back faced a minimum fillet radius at the hub, R2 (see Figure 14) in accordance with Table 23, shall be maintained. 5.9 Tolerances Tolerances on dimensions of flanges shall be as specified in Table 15. 5.10 Marking 5.10.1 Other than integral flanges All flanges, other than integral shall be marked as follows: a) Flange manufacturer's name or trademark, e.g. X; b) Number of this standard, i.e. EN 1759-1; c) Flange type number, e.g. 11; d) Nominal size (DN) or NPS, e.g. DN 150; e) Class designation, e.g. Class 150; f) Nominal size (DN) or NPS e.g. DN 150 or 6; Bore diameter B if necessary, e.g. 146 mm; g) Either material symbol or material number or material group (see Tables 3a and 3b), e.g. A 105; h) Cast number of melt identification or suitable quality control number traceable to the cast number, e.g. 12345; i) Flanges grooved for standard ring type joints shall be marked with the letter "R" and the corresponding ring number; EXAMPLE xxx/EN 1759-1/11/DN150//Class 150/146/A105/12345. For material repaired by welding see 5.2. SIST EN 1759-1:2005

5.10.2 Stamping Where steel stamps are used, the marking shall be positioned on the outer rim of the flange. NOTE Care should be taken to ensure that steel stamp markings are not liable to cause cracks in the flange material. 5.10.3 Omission of markings If a flange is too small to enable all the markings required then the minimum marking required shall be: a) Flange manufacturer's name or trademark; b) Letters "EN"; c) Class designation; d) Either the symbol or the number or the grade of the material or the material group; e) Cast number or melt identification or suitable control number. 5.10.4 Declaration of compliance Marking EN 1759-1, together with the flange manufacturer's name or trademark on or in relation to a product represents a flange manufacturer's declaration of compliance, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of this standard. Table 1 — Types of flange Type no.a Description 01 Plate flange for welding 05 Blank flange 11 Weld-neck flange 12 Hubbed slip-on flange for welding 13 Hubbed threaded flange 14 Hubbed socket-weld flange 15 Loose hubbed flange for lapped pipe end b 21 Integral flange NOTE Flanges and facings may be designated by type number and facing letter or by description as given in Figures 1 and 2 respectively. a Type numbers have been made non-consecutive to permit possible future
additions. b Sometimes referred to in industry as lapped flange.
Type 01, Plate flange for welding Type 05, Blank flange
Type 11, Weld-neck flange Type 12, Hubbed slip-on flange for welding
Type 13, Hubbed threaded flange Type 14, Hubbed socket weld flange
Type 15, Loose hubbed flange for lapped pipe end Type 21, Integral flange NOTE 1 Types 01 and 05 comprise flanges that do not incorporate hub or weld-neck. NOTE 2 Types 11 to 15 comprise flanges incorporating a hub or weld-neck and are manufactured from forgings or castings. NOTE 3 Type 21 is an integral part of some other equipment or component. NOTE 4 Flanges are designated by type numbers. Figure 1 — Flange types SIST EN 1759-1:2005

Type A, Flat face Type E, Spigot
Type B, Raised face Type F, Recess
Type CL (Large tongue) and type CS (Small tongue)Type J, Ring-joint
Type DL (Large groove) and type DS (small groove) NOTE 1 When provided with a 6,4 mm raised face, type B is identical to type E
NOTE 2 Sketches designated A,B,C,D,E,F and J illustrate the various types of flanges which may be used in conjunction with the flanges shown in Figure 1. NOTE 3 Facings are designated by type letters. Figure 2 — Facing of types A to F and J
150 X X X X X X X X X X X X X X X X X X X
Plate 01
150 X X X X X X X X X X X X X X X X X X X
300 X X X X X X X X X X X X X X X X X X X
600 X X X X X X X X X X X X X X X X X X X
900 Use Class 1500 X X X X X X X X X X X X 1500 X X X X X X X X X X X X X X X X X X X Blank 05 2500 X X X X X X X X X X X X X X
150 X X X X X X X X X X X X X X X X X X X
300 X X X X X X X X X X X X X X X X X X X
600 X X X X X X X X X X X X X X X X X X X
900 Use Class 1 500 X X X X X X X X X X X X 1 500 X X X X X X X X X X X X X X X X X X X Weld-neck 11 2 500 X X X X X X X X X X X X X X
150 X X X X X X X X X X X X X X X X X X X
300 X X X X X X X X X X X X X X X X X X X
600 X X X X X X X X X X X X X X X X X X X
900 Use Class 1 500 X X X X X X X X X X X X Hubbed slip-on 12 1 500 X X X X X X X
Table 2 (concluded) Nominal size, NPS (DN) ½ ¾ 1 1¼a1½ 2 2½a3 4 5a 6 8 10 12 14 16 18 20 24 Flange Type number Class (15) (20)(25)(32)(40)(50)(65)(80)(100) (125)(150)(200)(250)(300)(350)(400)(450)(500)(600)
150 X X X X X X X X X X X
300 X X X X X X X X X X X
600 X X X X X X X X X X X
900 Use Class 1 500
X X X
1 500 X X X X X X X X X X X
Hubbed threaded 13 2 500 X X X X X X X X X X X
150 X X X X X X X X
300 X X X X X X X X
600 X X X X X X X X
Hubbed socket-weld 14 1 500 X X X X X X X
150 X X X X X X X X X X X X X X X X X X X
300 X X X X X X X X X X X X X X X X X X X
600 X X X X X X X X X X X X X X X X X X X
900 Use Class 1 500 X X X X X X X X X X X X 1 500 X X X X X X X X X X X X X X X X X X X Loose hubbed for lapped pipe end 15 2 500 X X X X X X X X X X X X X X
150 X X X X X X X X X X X X X X X X X X X
300 X X X X X X X X X X X X X X X X X X X
600 X X X X X X X X X X X X X X X X X X X
900 Use Class 1 500 X X X X X X X X X X X X 1 500 X X X X X X X X X X X X X X X X X X X Integral 21 2 500 X X X X X X X X X X X X X X
a These sizes should be avoided in new constructions
c ISO 9327-1 F22 F13 F18 a, b c c 1.1 Plate ASTM A515 70 ASTM A516 70 ASTM A537 CL1
a, b
a, d
c ISO 9328-2 PH315 PH355 a, d a, d c Casting ASTM A216 WCC ASTM A352 LC2 LC3 LCC a, b c c c ISO 4991 C26-52H, N (+T) C26-52L C43L a, b c c Forging ASTM A350 LF3 c ISO 9327-1 F44 c 1.2 Plate ASTM A203 B E
a, b a, b ISO 9328-3 12 Ni 14 G1 a, b Casting ASTM A352 LCB a ISO 4991 C23-46BL a 1.3 Plate ASTM A203 A D ASTM A515 65 ASTM A516 65
a, b a, b
a, b
a, d ISO 9328-2 PH290 PH315 ISO 9328-3 12 Ni 14 G1 a, d a, d a, b Forging ASTM A350 LF1 c ISO 9327-1 F9 c 1.4 Plate ASTM A515 60 ASTM A516 60
a, b
a, d ISO 9328-2 PH235 PH265 PH290 a, d a, d a, d Casting ASTM A217 WC1 ASTM A325 LC1 b, e
c ISO 4991 C28H b, e Forging ASTM A182 F1 b, e ISO 9327-2 F28 b, e 1.5 Plate ASTM A204 A B
b, e b, e ISO 9328-2 16 Mo 3 b, e
Table 3a (continued) Material group Description ASTM specification and grade Remarks ISO standard and grade Remarks Casting ASTM A217 WC4 WC5
b f — — Forging ASTM A182 F2 b — —
1.7 Plate ASTM A204 C d — — Casting ASTM A217 WC6 g ISO 4991 C32H g Forging ASTM A182 F11 F12
h h — —
1.9 Plate ASTM A387 11 CL2 h — — Casting ASTM A217 WC9 g ISO 4991 C34AH g Forging ASTM A182 F22 g ISO 9327-2 F34Q h
1.10 Plate ASTM A387 22 CL2 h ISO 9328-2 13 CrMo 9 10 T2 h Casting ASTM A217 C5 — ISO 4991 C37H —
1.13 Forging ASTM A182 F5 F5a — — ISO 9327-2 F37 — Casting ASTM A217 C12 — ISO 4991 C38H —
1.14 Forging ASTM A182 F9 — — — Casting ASTM A351 CF8 CF3
— j ISO 4991 C46 C47
j — Forging ASTM A182 F304 F304H
— — ISO 9327-2 F49 —
2.1 Plate ASTM A240 304 304H
— j ISO 9328-5 X 5 CrNi 18 9 — Casting ASTM A351 CF8M CF3M
— d ISO 4991 C57 C61LC C60 C61
d d d d Forging ASTM A182 F316 F316H
— — ISO 9327-2 F62 F64
— —
2.2 Plate ASTM A240 316 317 316H
— — d ISO 9328-5 X 5 CrNiMo 17 12 — X 7 CrNiMo 17 12
d
j d ISO 9327-2 F46 F59
— — 2.3 Plate ASTM A240 304L 316L
j d ISO 9328-5 X 2 CrNi 18 10 X 2 CrNiMo 17 12 X 2 CrNiMo 17 13
j d d Forging ASTM A182 F321 F321H
b — ISO 9327-2 F53 F54B
b — 2.4 Plate ASTM A240 321 321H
b — ISO 9328-5 X 6 CrNiTi 18 10 X 7 CrNiTi 18 10
b — Forging ASTM A182 F347 F347H F348 F348H
b — b — ISO 9327-2 F50 F51 — —
b — — — 2.5 Plate ASTM A240 347 347H 348 348H
b — b — ISO 9328-5 X 6 CrNiNb 18 10 X 7 CrNiNb 18 10 — —
b — — — Casting ASTM A351 CH8 CH20
— —
— —
— — 2.6 Plate ASTM A240 309S — ISO 4955 H14 — Casting ASTM A351 CK20 — — — Forging ASTM A182 F310 k ISO 9327-2 F68 k 2.7 Plate ASTM A240 310S k ISO 4955 H15 k a Permissible but not recommended for prolonged use above about 425 °C. b Not to be used over 540 °C. c Not to be used over 345 °C. d Not to be used over 455 °C. e Permissible but not recommended for prolonged use above about 455 °C. f Not to be used over 565 °C. g Not to be used over 590 °C. h Permissible but not recommended for prolonged use above about 590 °C. j Not to be used over 425 °C. k For service temperature 565 °C and above, should be used only when assurance is provided that grain size is not finer
than ASTM No.6. SIST EN 1759-1:2005

Table 3b — Reference standards for EN materials Forgings Castings Hot rolled products Group Symbol Standard Material number Symbol Standard Material number Symbol Standard Material number 1E0 S235JR EN 10025 1.0037 — — — S235JR EN 10025 1.0037 1E1 S235JRG2 EN 10025 1.0038 — — — S235JRG2 EN 10025 1.0038 2E0 — — — GP240GR EN 10213-2 1.0621 — — — 3E0 P245GH EN 10222-2 1.0352 GP240GH EN 10213-2 1.0619 P265GH EN 10028-2 1.0425 3E1 P280GH EN 10222-2 1.0426 — — — P295GH EN 10028-2 1.0481 4E0 16Mo3 EN 10222-2 1.5445 G20Mo5 EN 10213-2 1.5419 16Mo3 EN 10028-2 1.5415 5E0 13CrMo4-5 EN 10222-2 1.7335 G17CrMo5-5 EN 10213-2 1.7357 13CrMo4-5 EN 10028-2 1.7335 6E0 11CrMo9-10 EN 10222-2 1.7383 G17CrMo9-10 EN 10213-2 1.7379 11CrMo9-10 EN 10028-2 1.7383 6E1 X16CrMo5-1+NT EN 10222-2 1.7366 GX15CrMo5 EN 10213-2 1.7365 — — — 13MnNi6-3 EN 10222-3 1.6217 G17Mn5 EN 10213-3 1.1131 P275NL1 EN 10028-3 1.0488 — — — G20Mn5 EN 10213-3 1.6220 P275NL2 EN 10028-3 1.1104 7E0 — — — — — — 11MnNi5-3 EN 10028-4 1.6212 — — — — — — P355NL1 EN 10028-3 1.0566 — — — — — — P355NL2 EN 10028-3 1.1106 15NiMn6 EN 10222-3 1.6228 — — — 15NiMn6 EN 10028-4 1.6228 12Ni14 EN 10222-3 1.5637 G9Ni14 EN 10213-3 1.5638 12Ni14 EN 10028-4 1.5637 7E1 12Ni19 EN 10222-3 1.5680 — — — 12Ni19 EN 10028-4 1.5680 7E2 X8Ni9 EN 10222-3 1.5662 — — — X8Ni9 EN 10028-4 1.5662 13MnNi6-3 EN 10222-3 1.6217 — — — 11MnNi5-3 EN 10028-4 1.6212 12Ni14 EN 10222-3 1.5637 — — — 12Ni14 EN 10028-4 1.5637 — EN 10222-3 1.5680 — — — 12Ni19 EN 10028-4 1.5680 7E3 X8Ni9 EN 10222-3 1.5662 — — — X8Ni9 EN 10028-4 1.5662 8E0 — — — — — — P275N EN 10028-3 1.0486 8E1 — — — — — — P355N EN 10028-3 1.0562 8E2 P285NH EN 10224-4 1.0487 — — — P275NH EN 10028-3 1.0487 8E3 P355NH EN 10222-4 1.0565 — — — P355NH EN 10028-3 1.0565 9E0 X20CrMoV11-1 EN 10222-2 1.4922 GX23CrMoV12-1 EN 10213-2 1.4931 — — — 10E0 X2CrNi18-9 EN 10222-5 1.4307 GX2CrNi19-11 EN 10213-4 1.4309 X2CrNi18-9 EN 10028-7 1.4306 10E1 X2CrNiN18-10 EN 10222-5 1.4311 — — — X2CrNiN18-10 EN 10028-7 1.4311 11E0 X5CrNi18-10 EN 10222-5 1.4301 GX5CrNi19-10 EN 10213-4 1.4308 X5CrNi18-10 EN 10028-7 1.4301 12E0 X6CrNiTi18-10 EN 10222-5 1.4541 — — — X6CrNiTi18-10 EN 10028-7 1.4541 — — — — GX5CrNiNb19-11 EN 10213-4 1.4552 X6CrNiNb18-10 EN 10028-7 1.4550 13E0 X2CrNiMo17-12-2 EN 10222-5 1.4404 GX2CrNiMo19-11-2 EN 10213-4 1.4409 X2CrNiMo17-12-2 EN 10028-7 1.4404 13E1 X2CrNiMoN17-11-2 EN 10222-5 1.4406 — — — — — — 14E0 X5CrNiMo17-12-2 EN 10222-5 1.4401 GX5CrNiMo19-11-2 EN 10213-4 1.4408 X5CrNiMo17-12-2 EN 10028-7 1.4401 15E0 X6CrNiMoTi17-12-2 EN 10222-5 1.4571 — — — X6CrNiMoTi17-12-2 EN 10028-7 1.4571
— — — GX5CrNiMoNb19-11-2 EN 10213-4 1.4581 X6CrNiMoNb17-12-2 EN 10028-7 1.4580
Hub type flange Blank flange (threaded as Note) A hub is required if the nominal size of the reduced bore is equal to or greater than the size given in Table 4 for the nominal pipe size of the flange. Otherwise, a blank flange suitably tapped may be used. The nominal size appropriate to a flange of a given outside diameter and pressure Class may be found by reference to the Table of standard flanges of the same pressure Class (see Tables 9 to 14). NOTE The threading and counterbore etc., should be in accordance with 5.6.3 Figure 3 — Reducing threaded and slip-on flanges, all Classes (see Table 4) Table 4 — Reducing threaded and slip-on flanges, all Classes Nominal pipe size appropriate to the diameter of the flange Smallest nominal size of reduced bore requiring hub
(see explanation in Figure 3) NPS DN For thread ASME B1.20.1
25½
1¼a
½
1½
½
2½a
1¼
1¼
4 100
1½
5a 125
1½
6 150
2½
8 200
10 250
12 300
14 350
16 400
18 450
20 500
24 600
4 a The use of these sizes should be avoided in new constructionsSIST EN 1759-1:2005

Dimensions in millimetres
Type A (Flat face) Type B 1,6 mm (Raised face)
Type CL (Large tongue face) or type CS (Small tongue face) Type E (Spigot face (Large male))
Type DL (Large groove face) or type DS (Small groove face) Type FC (Recess face (Large female))
Type J (Ring-joint face) NOTE 1 For dimensions X, O, M, W, Z and other details for facings other than ring-joint, see Table 5. NOTE 2 For other dimensions and details of ring-joint facings, see Table 6. NOTE 3 C is the minimum flange thickness, see Tables 9 and 10. NOTE 4 Dotted lines indicate full-face. NOTE 5 Spigot/recess and tongue/groove faces are not applicable to Class 150 because of potential dimensional conflicts. Figure 4 — Flange facings, Classes 150 and 300 only, for other than lapped-type joints SIST EN 1759-1:2005

Type B (6,4 mm Raised face) Type CL (Large tongue face) or type CS (Small tongue face)
Type E (Spigot face (Large male)) Type DL (Large groove face) or type DS (Small groove face)
Type F (Recess face (Large female)) Type J (Ring-joint face) NOTE 1 For dimensions X, O, M, W, Z and other details for facings other than ring-joint, see Table 5. NOTE 2 For other dimensions and details of ring-joint facings, see Table 6. NOTE 3 C is the minimum flange thickness, see Tables 11, 12, 13 and 14. NOTE 4 Dotted lines indicate full-face. Figure 5 — Flange facings, Classes 600 to 2 500, for other than lapped-type joints SIST EN 1759-1:2005

Dimensions in millimetres
6,4 or t which ever is greater Type B (Raised face) Type CL (Large tongue face) or type CS (Small tongue face)
Type E (Spigot face (Large male)) Type DL (Large groove face) or type DS (Small groove face)
Type F (Recess face (Large female)) Type J (Ring-joint face) NOTE 1 For dimensions X, O, M, W, Z and other details for facings other than ring-joint, see Table 5. NOTE 2 For other dimensions and details of ring-joint facings, see Table 6. NOTE 3 C is the minimum flange thickness, see Tables 9 to 14. NOTE 4 t = thickness of barrel of stub-end (see 5.7.2). Figure 6 — Facings for lapped-type joints SIST EN 1759-1:2005

Height of raised face Outside diameter of small tongue and groove type Outside diameter ofraised face,spigot Inside diameterof tongue Outside diameterof recess Inside diameter Type F, DL, DS outside diameter raised portion Nominal size CS DS Type B, E, CL Type CL, CSType F Type DL, DS Classes 150and 300b Classes 600 to 2 500c Depth of recessor groove F, DL DS T Y R U W Z
L K NPS DN mm mm mm mm mm mm mm mm mm mm mm ½ 15
35,1
36,6
35,1
25,4
36,6
23,9 1,6 6,4 4,8
46,0
44,5 ¾ 20
42,9
44,5
42,9
33,3
44,5
31,8 1,6 6,4 4,8
53,8
52,3 1 25
47,8
49,3
50,8
38,1
52,3
36,6 1,6 6,4 4,8
62,0
57,2 1¼a 32
57,2
58,7
63,5
47,8
65,0
46,0 1,6 6,4 4,8
74,7
66,5 1½ 40
63,5
65,0
73,2
53,8
74,7
52,3 1,6 6,4 4,8
84,1
73,2 2 50
82,6
84,1
91,9
73,2
93,7
71,4 1,6 6,4 4,8 103,1
91,9 2½a 65
95,3
96,8 104,6
85,9 106,4
84,1 1,6 6,4 4,8 115,8 104,6 3 80 117,3 119,1 127,0 108,0 128,5 106,4 1,6 6,4 4,8 138,2 127,0 4 100 144,5 146,1 157,2 131,8 158,8 130,0 1,6 6,4 4,8 168,1 157,2 5a 125 173,0 174,8 185,7 160,3 187,5 158,8 1,6 6,4 4,8 196,9 185,7 6 150 203,2 204,7 215,9 190,5 217,4 189,0 1,6 6,4 4,8 227,1 215,9 8 200 254,0 255,5 269,7 238,3 271,5 236,5 1,6 6,4 4,8 280,9 269,7 10 250 304,8 306,3 323,9 285,8 325,4 284,2 1,6 6,4 4,8 335,0 323,9 12 300 362,0 363,5 381,0 342,9 382,5 341,4 1,6 6,4 4,8 392,9 381,0 14 350 393,7 395,2 412,8 374,7 414,3 373,1 1,6 6,4 4,8 423,9 412,8 16 400 447,5 449,3 469,9 425,5 471,4 423,9 1,6 6,4 4,8 481,1 469.9 18 450 551,0 512,8 533,4 499,0 534,9 487,4 1,6 6,4 4,8 544,6 533,4 20 500 558,8 560,3 584,2 533,4 585,7 531,9 1,6 6,4 4,8 595,4 584,2 24 600 666,8 668,3 692,2 641,4 693,7 639,8 1,6 6,4 4,8 703,3 692,2 NOTE 1 This Table should be read in conjunction with 5.7 and Figure 4, 5 and 6. NOTE 2 For ring-joint facing dimensions, see Table 6. NOTE 3 For tolerances, see Table 15. a The use of these sizes should be avoided in new constructions. b Raised face height is included in the flange thickness. c Raised face height is additional to the minimum flange thickness.
Figure 7 — Dimensions of ring-joint facings Type J (all Classes) (see Table 6)
flanges S, when ring is compressedClass 150 Class 300 Class 600 Class 900 Class 1 500 Class 2 500 Pitchdia. DepthWidthRadiusat bottomClass 150 Class300andClass600 Class900 Class1 500Class2 500Class150 Class300 Class600 Class900 Class1 500Class2 500 P E F Rmax
NPS DN in DN in DNin DN in DN in DN mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm — —
½ 15
½ 15 — — — — — — R11
34,135,56
7,140,8 —
50,8— — — — 3 3 — — — — — — — — — — —
½ 15 — — R12
39,696,35
8,730,8 — — —
60,3— — — — — 4 — — —
¾ 20
¾ 20 — — — —
½ 15 R13
42,866,35
8,730,8 —
63,5— —
65,1— 4 4 — — 4 — — — — — — — —
¾ 20 — — R14
44,456,35
8,730,8 — — —
66,7— — — — — 4 —
1 25 — — — — — — — — — — R15
47,636,35
8,730,8
63,5 — — — — 4 — — — — — — —
1 25
1 25 — —
1 25
¾ 20 R16
50,806,35
8,730,8 —
69,8—
71,4
73,0— 4 4 — 4 4
1¼ 32 — — — — — — — — — — R17
57,156,35
8,730,8
73,0 — — — — 4 — — — — — — —
1¼ 32
1¼ 32 — —
1¼ 32
1 25 R18
60,336,35
8,730,8 —
79,4—
81,0
82,5— 4 4 — 4 4
1½ 40 — — — — — — — — — — R19
65,096,35
8,730,8
82,6 — — — — 4 — — — — — — —
1½ 40
1½ 40 — —
1½ 40 — — R20
68,266,35
8,730,8 —
90,5—
92,1— — 4 4 — 4 — — — — — — — — — — —
1¼ 32 R21
72,237,9411,910,8 — — — — 101,6— — — — — 3
2 50 — — — — — — — — — — R22
82,556,35
8,730,8 101,6 — — — — 4 — — — — — — —
2 50
2 50 — — — —
1½ 40 R23
82,557,9411,910,8 — 108,0— — 114,3— 6 5 — — 3 — — — — — — — —
2 50 — — R24
95,257,9411,910,8 — — — 123,8— — — — — 3 —
2½ 65 — — — — — — — — — — R25 101,606,35
8,730,8 120,6 — — — — 4 — — — — — — — 2½ 65 2½65 — — — — 2 50 R26 101,607,9411,910,8 — 127,0— — 133,4— 6 5 — — 3 — — — — — — — — 2½ 65 — — R27 107,957,9411,910,8 — — — 136,5— — — — — 3 — — — — — — — — — — — 2½65 R28 111,139,5213,491,6 — — — — 149,2— — — — — 3
3 80 — — — — — — — — — — R29 114,306,35 8,730,8 133,4 — — — — 4 — — — — — — — — — — — — — — — — — R30 117,487,9411,910,8 — — — — — — — — — — — SIST EN 1759-1:2005

Table 6 (continued) Nominal size (NPS) GroovenumberGroove dimensions Diameter of raised portion, K min Approximate distance between
flanges S, when ring is compressedClass 150 Class 300 Class 600 Class 900 Class 1 500 Class 2 500 Pitchdia. DepthWidthRadiusat bottomClass 150 Class300andClass600 Class900 Class1 500Class2 500Class150 Class300 Class600 Class900 Class1 500Class2 500 P E F Rmax
NPS DN in DN in DNin DN in DN in DN mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm — — 3
80 3
80 — — — — R31 123,83
7,9411,910,8 — 146,0155,6— — — 6 5 4 — — — — — — — — — — — — 3
80R32 127,00
9,5213,491,6 — — — — 168,3— — — — — 3 — — — — — — — — — — — — R33 131,76
6,35
8,730,8 154,0 — — — — 4 — — — — — — — — — — — — — — — — — R34 131,76
7,9411,910,8 — 158,8— — — — 6 5 — — — — — — — — — — — 3
80 — — R35 136,53
7,9411,910,8 — — — 168,3— — — — — 3 — 4 100 — — — — — — — — — — R36 149,23
6,35
8,730,8 171,4 — — — — 4 — — — — — — — 4 100 4 1004 100 — — — — R37 149,23
7,9411,910,8 — 174,6181,0— — — 6 5 4 — — — — — — — — — — — — 4 100R38 157,1611,1116,670,8 — — — — 203,2— — — — — 4 — — — — — — — — 4 100 — — R39 161,93
7,9411,910,8 — — — 193,7— — — — — 3 — 5 125 — — — — — — — — — — R40 171,45
6,35
8,730,8 193,7 — — — — 4 — — — — — — — 5 125 5 1255 125 — — — — R41 180,98
7,9411,910,8 — 209,6215,9— — — 6 5 4 — — — — — — — — — — — — 5 125R42 190,5012,7019,841,6 — — — — 241,3— — — — — 4 6 150 — — — — — — — — — — R43 193,68
6,35
8,730,8 219,1 — — — — 4 — — — — — — — — — — — — — 5 125 — — R44 193,68
7,9411,910,8 — — — 228,6— — — — — 3 — — — 6 150 6 1506 150 — — — — R45 211,14
7,9411,910,8
...